S557-96

1. SCOPe 1.1 These requirements apply to the construction and performance of back-pack fire extinguishers for use in fighting forest, brush, and grass fires. Back-pack extinguishers shall be classified under the following types: Type 1 - Rigid Metal Tank Type 2 - Rigid Plastic Tank Type 3 - Soft Tank 1.2 Back-pack fire extinguishers are intended for the use with water, wetting agents, and Class A foams. NOTE: Reference to each applicable Test Method for a requirement is indicated by the letters TM and the appropriate Clause or Subsection number in parentheses in the right-hand margin.